Apparatus for heating air by steam or vapor heat.



m. 633,9". v Patant ed Sept. "26, 1899. a. SEAGRAVE & s. B. BEVINGTON. APPARATUS FOR HEATING AIR BY STEAM 0B VAPOR "EMT A nmim 11M ll". 20, 1597.

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, o UNrrnn' STATES I PATENT Oriucn.

enoncn SEAGRAVE, or WALTHAMSTOW, AND SAMUEL BOURNE sEvrNoroN,

- on LoNDoN, ENGLAND.

- APPARATUS FOR HEATING A IR BY STEAM OR VAPOR HEAT.

SPECIFICATION forming part of Letters Patent No. 633,911, dated September 26, 1899.

Application filed November 20, 1897. Serial No. 669,316 (No model.) I

To LLZZ whmn it may concern: 1

Be it known that we, Gnonen SEAGRAVE, residing at Cooks FollyJValthamstow,county of Essex, and SAMUEL BOURNE BnvlNeroN, 5 residing at St. Thomas street, Bermondsey, London, county of Surrey, England, subjects of the Queen of GreatBritain, have invented certain new and useful Improvements in Apparatus for Heating Airby Steam or Vapor to Heat, (patented in Great Britain, No. 2,826, dated February 8, 1895, and in France, No. 252,961, dated January 4, 1896,) of which the following is a specification.

The purpose of our invention is to provide an apparatus of simple and improved construction and organization for heatingair for drying and other uses.

Our invention willbe understood from the following description, taken in connection with the accompanying drawings, in which- Figure 1 is a'vertical section taken upon the line 1 '1 in Fig. 2. Fig. 2 is a horizontal section on the line 2 2 in Fig. 1. Fig. 3 is a transverse vertical section upon the line 3 3 in Fig. 2. Fig. 4: is a sectional elevation showing the fan-casing connected to the heater and an air-conduit leading from said casing to a point where the heated air is to be utilized.

In the practical use of. our invention we construct a box or cas ngB, its run bein g provided with suitable flanges N N, so that-they 'may be bolted to the top and bottom plates of said box. At one end'this box is provided 5 with an inlet-chamber O,which may be placed at either end of the box to form steam-entries or to permit the connection of a second box,

so that the apparatus may be extended to any degree required. The box is provided 40 with one or more partitions D, by which the steam is caused to have a sinuous or prolonged movement in the box as it travels through pipes E, which connect the box B with a box'B, similarly constructed save that 5 it has no steam' inlet O. The lower ends of the pipes E are fitted to openings in the upper wall of the lower boxB and their upper ends in openings in the lower wall of the upper box B.

Within the pipes E are concentrically arranged smaller pipes H, their exterior diameter being. such that suitable annular spaces I are formed between said pipes H and the inner surfaces of the pipes E. The pipes H pass entirely through both the lower and the upper box, their lower ends being fitted in openings in the bottom wall of the box 13 and their upper ends similarly connected'to the upper or top wall of the upper box B. By thisarrangement air can be drawn into the upper open ends of said pipes by the fan, (shown in Fig; 4,)and after issuing from said pipes H at their lower ends this air,which has been heated by passing through the pipes, is drawn into the fan-casing and thence forced into a suitable conduit, one or more, through which it is driven to the point where its heat can be utilized. Air is also drawn in by the fan from the front and ends of the apparatus and is heated by passing between and in contact with the exterior pipes E.- An outlet J is provided for the water formed by "condensation. 1

One end of the casing may be entirely open, or it may be partly or wholly closed and openings formed in the side opposite the fan, so that a full volume of air can be drawn in.

To avoid the labor and time required in forming apertures for the ends of the pipes E and Hwe may use in making the boxes a cast-metal rim and wrought-metal top and bottom platesL and M, as shown in Figs. 1 and Said plates being of such size as to overlap the flanges N, which form part of the rim of the box B or B, the openings for the sively formed in these plates;

Our invention is specially adapted for heatiug airby exhaust-steam from an engine. The air maybe used for any of the purposes for which dry heated air is adapted.

In Fig. 4 of the drawings we have shown a heater and a fan R, inclosed in a casing \V. This casing covers or closes the rear side only of the heater or groupof pipes, leaving the front and both ends open for the air which is drawn in by the fan. The-pipes H being open at their upper ends above the upper box and at their lower ends below the lower box and the space beneath the bottom of the lower box being closed behind by the fan-casing, as shown in Fig; 4, and at both ends, the sucpipeends are more easily and less expention of the fan causes air to How downward in said pipes H, as shown by the arrows in Figs, 1 and 2 andin Fig. 4, besides drawing air from the front and both ends of the gang of pipes, as indicated by the arrows in Fig. 3. An air-conduit T communicates with the fan-casing and conducts the heated air to the point Where it is required. In Fig. 4 we have shown this conduit as arranged to discharge through an opening V in a wall S, but any other arrangement can be substituted.

What We claim is An air-heater having an upper and lower box, a series of steam-pipes opening through the top of the lowerbox and the bottom of the upper box, a series of air pipes passing through the steam-pipes and forming annu- 

